Any study forecasting conditions four decades hence will be faced with large uncertainties and these need to be borne in mind in interpreting the results of this study. One uncertainty concerns the pathway of GHG emissions. To address that issue, the city case studies examined both a high and a low GHG emissions scenario to bracket the likely future conditions. In the climate change downscaling methodologies, there are uncertain- ties in forecasting the increase in extreme and seasonal precipitation under the different sce- narios. The techniques applied in the statistical downscaling examined the results from sixteen atmosphere-ocean general circulation models (AOGCM). Robust.
